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Message Error when generating PDF

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Message Error when generating PDF

I'm using Web Report Studio and when I click print / PDF Generate appears the following error message:

Error messages:

An error occurred in the processing of the page request.

  java.lang.NullPointerException

        at com.sas.report.render.view.pdf.itext.adapters.ViewAdapter.prepareAdapter (ViewAdapter.java: 101)

        at com.sas.report.render.view.pdf.itext.PdfView.prepareAdapters (PdfView.java: 190)

        at com.sas.report.render.view.pdf.itext.PdfView.initialize (PdfView.java: 155)

        at com.sas.report.render.view.pdf.itext.PdfView.writeContent (PdfView.java: 218)

        at com.sas.report.render.view.pdf.itext.PdfView.write (PdfView.java: 203)

        at com.sas.apps.citation.model.report.RenderedReportModel._execWritePDF (RenderedReportModel.java: 327)

        at com.sas.apps.citation.model.report.RenderedReportModel.writePDF (RenderedReportModel.java: 291)

        at com.sas.apps.citation.model.report.PDFGenerator.print (PDFGenerator.java: 317)

        at com.sas.apps.citation.model.report.PDFGenerator.getPDFStream (PDFGenerator.java: 94)

        at com.sas.apps.citation.model.report.RenderingImpl.getPDFStream (RenderingImpl.java: 406)

        at com.sas.apps.citation.view.beans.PrintOptionFormBean.previewReport (PrintOptionFormBean.java: 606)

        at com.sas.apps.citation.controller.action.PrintPreviewAction.applyDialog (PrintPreviewAction.java: 201)

        at com.sas.apps.citation.controller.action.CitationDialogAction.doPerform(CitationDialogAction.java:163)

        at com.sas.apps.citation.controller.action.CitationAction._execute (CitationAction.java: 191)

        at com.sas.apps.citation.controller.action.CitationAction.execute (CitationAction.java: 166)

        at org.apache.struts.action.RequestProcessor.processActionPerform (RequestProcessor.java: 425)

        [59 lines suppressed]

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